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H o w t h e G H - 7 0 3 O p e r a t e s
When the tool is pressurized by hooking up to an
air line, the valve spool is forced upward. This
movement aligns the port in the spool with the lower
port within the handle, allowing air pressure to enter
the bottom port of the power air cylinder. This forces
the air piston upward.
When the trigger is depressed, air bleeds out from
behind the trigger, lowering air pressure against the
bottom of the spool. Air pressure is now greater on
top of the spool, forcing it down. This action shuts
off the air path to the bottom of the power air cylinder,
and simultaneously opens the upper port, allowing
pressure to enter directly into the top of the air
cylinder. This forces the air piston downward.
The air piston is connected to the hydraulic power
piston with a common connecting rod. When the
SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE.
air piston is activated by changes in the air valve,
it in turn activates the hydraulic power piston. Air
pressure also travels up through a port in the handle
to enter the rear of the head cylinder. This air
pressure forces the return of the head piston to its
full forward position.
The center area of the handle (that part held by the
hand during riveting) contains the hydraulic system.
The hydraulic power piston has its own cylinder
containing the fluid which is pressurized by the
downward travel of the piston. This forces the fluid
up through the handle into the front of the head
cylinder, thereby exerting the force needed to push
the head piston back in a full 3/4" rivet setting stroke.
This same fluid then returns to the power cylinder
by the forward action of the head piston under air
pressure.
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